added simple search feature

lib/pages/collections_list_page.dart

@@ -7,6 +7,7 @@ import '../service/shared_link_provider.dart';
 import '../service/storage.dart';
 import '../widgets/create_bookmark_collection_dialog.dart';
 import 'collection_page.dart';
+import 'search_page.dart' show SearchPage;
 
 class CollectionsListPage extends StatefulWidget {
   const CollectionsListPage({super.key});
@@ -88,6 +89,12 @@ class _CollectionsListPageState extends State<CollectionsListPage> {
             TextButton(
               onPressed: () => provider.removeCurrentMapsLink(),
               child: Text('Cancel'),
+            )
+          else
+            IconButton(
+              onPressed: () =>
+                  Navigator.of(context).pushNamed(SearchPage.routeName),
+              icon: Icon(Icons.search),
             ),
         ],
       ),

lib/pages/search_page.dart

@@ -1,11 +1,43 @@
 import 'package:flutter/material.dart';
 
-class SearchPage extends StatelessWidget {
+import '../model/bookmark.dart';
+import '../service/storage.dart';
+import '../widgets/search_widgets/search_bar_widget.dart';
+import '../widgets/search_widgets/search_results_widget.dart';
+
+class SearchPage extends StatefulWidget {
   const SearchPage({super.key});
+
   static const String routeName = '/search';
 
+  @override
+  State<SearchPage> createState() => _SearchPageState();
+}
+
+class _SearchPageState extends State<SearchPage> {
+  final List<Bookmark> allBookmarks = Storage.loadBookmarks();
+  String searchString = '';
+
   @override
   Widget build(BuildContext context) {
-    return const Placeholder();
+    return Scaffold(
+      appBar: AppBar(title: Text('Search')),
+      body: Column(
+        children: [
+          SearchBarWidget(
+            onEditingComplete: (searchString) => setState(() {
+              this.searchString = searchString;
+            }),
+          ),
+          Expanded(
+            child: SearchResultsWidget(
+              bookmarks: allBookmarks.where(
+                (bookmark) => bookmark.name.contains(searchString),
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
   }
 }